#1371E7

CSS

:root {
  --deep-sky-blue: #1371e7;
  --deep-sky-blue-rgb: 19 113 231;
  --deep-sky-blue-oklch: oklch(0.568 0.197 257.7);
}

.element {
  color: var(--deep-sky-blue);
  background-color: hsl(213 85% 49%);
  border-color: oklch(0.568 0.197 257.7);
}

Tailwind CSS v4

@theme {
  --color-deep-sky-blue: #1371e7;
  --color-deep-sky-blue-50: #d4f7ff;
  --color-deep-sky-blue-100: #c1eaff;
  --color-deep-sky-blue-200: #a2d5ff;
  --color-deep-sky-blue-300: #79b7ff;
  --color-deep-sky-blue-400: #4b9cff;
  --color-deep-sky-blue-500: #1580ff;
  --color-deep-sky-blue-600: #166cdb;
  --color-deep-sky-blue-700: #1257b1;
  --color-deep-sky-blue-800: #004084;
  --color-deep-sky-blue-900: #022c5d;
  --color-deep-sky-blue-950: #001940;
}

SCSS

$deep-sky-blue: #1371e7;
$deep-sky-blue-rgb: 19, 113, 231;
$deep-sky-blue-light: mix(#fff, $deep-sky-blue, 20%);
$deep-sky-blue-dark: mix(#000, $deep-sky-blue, 20%);

.element {
  color: $deep-sky-blue;
  box-shadow: 0 0 0 2px rgba($deep-sky-blue, 0.35);
}